Fatemeh Rahimi Mehr, S. Kamrani, Claudia Fleck, Mohammad Salavati
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引用次数: 0
摘要
在不影响强度的前提下改善镁-碳化硅纳米复合材料的韧性变形行为对提高其机械性能至关重要。Mg-SiC 纳米复合材料是通过机械研磨、冷等静压、烧结和热挤压工艺制成的。本研究对 Mg-SiC 纳米复合材料的单轴应力-应变响应和变形行为进行了研究,并将其与纯镁样品进行了比较。在扫描电子显微镜下,分别采用光显微照片和原位加载样品,在宏观和微观两个尺度上通过二维(2D)数字图像相关(DIC)对变形行为进行了研究。与纯镁样品相比,力学测试结果表明 Mg-SiC 纳米复合材料的强度(80 兆帕)和断裂应变(23.5%)均有显著提高。三维(3D)代表体积元素(RVE)模型揭示了颗粒分散对纳米复合材料机械性能的影响。与 Mg-SiC 纳米复合材料中 SiC 粒子的异质分散相比,RVE 结果表明 SiC 粒子均匀分散的样品具有韧性变形行为。结果表明,DIC 和 RVE 对 Mg-SiC 纳米复合材料的宏观和微观预测结果非常一致。
Global and Local Deformation Analysis of Mg-SiC Nanocomposites: Digital Image Correlation (DIC) and Representative Volume Element (RVE) Techniques
Improving the ductile deformation behavior of Mg-SiC nanocomposites without compromising strength is critical to enhancing their mechanical properties. Mg-SiC nanocomposites are produced through mechanical milling, cold isostatic pressing, sintering, and hot extrusion processes. This study investigates the uniaxial stress–strain response and deformation behavior of the Mg-SiC nanocomposite compared to pure Mg samples with and without the milling process. The deformation behavior was investigated by two-dimensional (2D) digital image correlation (DIC) at two macroscopic and microscopic scales, employing light micrographs and in situ loading samples, respectively, in the scanning electron microscope. Compared to the pure Mg samples, the mechanical test results demonstrated a significant improvement in strength (80 MPa) and fracture strain (23.5%) of the Mg-SiC nanocomposite. The three-dimensional (3D) representative volume element (RVE) model revealed the particle dispersion effect on the mechanical properties of the nanocomposite. The RVE results demonstrate ductile deformation behavior in the sample with homogenous dispersion of SiC particles compared with the heterogeneous dispersion of SiC particles in Mg-SiC nanocomposite. The results demonstrated a good agreement between DIC and RVE predictions for Mg-SiC nanocomposites across macro- and microscales.